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• Video stream analysis on the fly - advise ?

  12 août 2020, par jakkolwiek

  I'm planning to develop a simple solution that would able me to perform a very basic video stream analysis on the fly. I've never done anything like that before, hence the very general and open question. The main focus is on checking if the stream is going without problems like - freeze frames, black screens and if the audio is there. Sync is out of scope. I read about open libraries like OpenCV and Xuggler, but they seem more complex than for my needs. FFmpeg is able to detect black screens, but not on the fly.

  



  Is there any other open lib I could look into ? Could you advise me anything ? I'm thinking about using Java or Python. Or maybe both. Efficiency of the solution is out of scope, I'm focusing now only on freeze frames and black screens detection.

  



  Any advise is welcome !

  



  Best regards, 
Peter

  


• Strange libavformat dependency with Jackmp

  13 avril 2015, par Martin Delille

  I try to execute my application on another Mac than my development machine and I have the following error :

  Dyld Error Message:
  
      Library not loaded: /System/Library/Framework/Versions/A/Jackmp
  
      Referenced from: /Volumes/FFmpegTest_v1.0.1/FFmpegTest.app/Contents/Frameworks/libavformat.56.dylib

  It seems that this Jackmp library is a new dependency (not present in earlier libavformat dependencies) as I can check with :

  otool -L /usr/local/lib/libavformat.dylib

  Any idea ?

• What is pkt_size in ffprobe -show_frames ?

  8 juillet 2020, par Null_404

  I am running ffprobe -show_frames and _show_packets on a .ts file and trying to find the size of each I B P frame in the stream. Is this field in the -show_frames option getting what I need ?

  


  And for the size field given by -show_packets, all the packets are very different sizes. I thought the TS packets should all be around 188 bytes, but that doesn't seem to be the case based on the output.

  


  Thanks in advance